JLG Lull 1044C-54 II Series Service Manual page 174

Boom and Transfer
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4. Remove coil (Item 2) from solenoid valve.
5. Loosen and remove solenoid valve from valve body.
6. Remove O-rings and backup rings (Items 4 thru 8) from solenoid valve.
Discard O-rings and backup rings.
7. Repeat Step 3 thru Step 6 for the other solenoid valve.
8. Clean all remaining parts with solvent and dry with compressed air.
Visually inspect the valve body to make sure all cavities are free of
contamination including burrs and chips as well as pieces of O-rings.
Inspect for all parts for damage and replace as necessary.
9. Obtain seal kit. Lubricate each O-ring and backup ring before installing
it. Install O-rings on each solenoid valve in descending order, making
sure the largest is installed first and the smallest last. Make sure that
O-rings (Items 6 and 8) are installed between their backup rings.
10. Check valves for any visible contamination. Dip each valve in clean oil
up to the largest O-ring (Item 4) before installing it in the valve body.
11. Install valves on valve body (Item 10). Torque each valve to 20 ft-lbs.
12. Install coil (Item 2) on solenoid valve with nut (Item 1). Torque nut to
5 ft-lbs.
13. Install two (2) orifices in the valve body. Torque orifices to 30–40 in-lbs.
14. Install two (2) O-ring plugs in valve body. Torque plugs to
125–145 in-lbs.
15. Install four (4) connectors in ports A3, B3, P1, and P2. Torque
connectors to 160–180 in-lbs.
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